Allow null pointers as arguments to Boundary_SelectedGVs.

git-svn-id: http://svn.cactuscode.org/arrangements/CactusBase/Boundary/trunk@225 6a38eb6e-646e-4a02-a296-d141613ad6c4

1 files changed, 16 insertions, 6 deletions

diff --git a/src/Boundary.c b/src/Boundary.c
index 84c2f54..99ec619 100644
--- a/src/Boundary.c
+++ b/src/Boundary.c
@@ -831,12 +831,22 @@ CCTK_INT Bdry_Boundary_SelectedGVs(CCTK_POINTER GH,
 	printf("      current->next is %p\n",current->next);
 #endif
 
-	/* One should be able to pass NULL to ignore the values in any of these 
-	   arrays... */
-	((int *) faces)[i] = current->faces;
-	((int *) widths)[i] = current->width;
-	((int *) table_handles)[i] = current->table;
-	((int *) var_indices)[i] = current->var;
+	if (faces)
+	{
+	  ((int *) faces)[i] = current->faces;
+	}
+	if (widths)
+	{
+	  ((int *) widths)[i] = current->width;
+	}
+	if (table_handles)
+	{
+	  ((int *) table_handles)[i] = current->table;
+	}
+	if (var_indices)
+	{
+	  ((int *) var_indices)[i] = current->var;
+	}
       }
     }
   }